12390121 has 2 divisors, whose sum is σ = 12390122. Its totient is φ = 12390120.

The previous prime is 12390107. The next prime is 12390151. The reversal of 12390121 is 12109321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8042896 + 4347225 = 2836^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 12390121 - 2¹¹ = 12388073 is a prime.

It is a super-3 number, since 3×12390121³ (a number of 22 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (12390151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195060 + 6195061.

It is an arithmetic number, because the mean of its divisors is an integer number (6195061).

Almost surely, 2^12390121 is an apocalyptic number.

It is an amenable number.

12390121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12390121 is an equidigital number, since it uses as much as digits as its factorization.

12390121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 12390121 is about 3519.9603690951. The cubic root of 12390121 is about 231.3974218496.

Adding to 12390121 its reverse (12109321), we get a palindrome (24499442).

The spelling of 12390121 in words is "twelve million, three hundred ninety thousand, one hundred twenty-one".